CHATTANOOGA — Chattanooga police say the discovery of a woman's body in the Tennessee River has become a homicide investigation.

The Chattanooga Times Free Press (http://bit.ly/10BhzUg ) reported that authorities said on Wednesday the medical examiner's office found 57-year-old Deborah Underhill's body bore what were termed "suspicious wounds." Police did not elaborate.

Underhill's body was discovered around 6 p.m. Friday. She was last seen alive on Thursday when she checked into a psychiatric services agency. A friend reported her missing about 12 hours later.

Police said Underhill was known to frequent downtown Chattanooga, particularly the public library.